Control rod driving mechanism for ship reactor

Abstract

The invention discloses a control rod driving mechanism for a ship reactor. The control rod driving mechanism comprises a pressure-resistant shell component, a rod-falling auxiliary component, a rod position detector component, a claw component, a driving rod component and a coil component; the pressure-resistant shell part comprises an end plug at an upper part, a rod travel sleeve, and a sealingshell at a lower part; the sealing shell is fixedly connected with a pressure container top cover, so that a pressure boundary is jointly formed. The driving mechanism is characterized in that the coil component sleeves the outer side of the pressure-resistant shell component and consists of three electromagnetic coils and a magnet yoke, the three electromagnetic coils are respectively a liftingcoil, a moving coil and a fixed coil from top to bottom; the claw component is provided with an iron core assembly corresponding to the coil component, the iron core assembly comprises a locking ironcore assembly, a lifting iron core assembly, a movable iron core assembly and a fixed iron core assembly from top to bottom, and the lifting coil provides an electromagnetic field for the locking ironcore assembly and the lifting iron core assembly of the claw component at the same time.

Description

technical field [0001] The invention belongs to the field of ship reactors, and more specifically, the invention relates to a control rod driving mechanism for a ship reactor. Background technique [0002] The Control Rod Drive Mechanism (CRDM for short) is the action actuator of the important control system and safety protection system of the reactor. Normal or accident shutdown. [0003] At present, there are three main types of control rod drive mechanisms used in nuclear power reactors: [0004] 1) Reluctance motor type control rod drive mechanism; [0005] 2) Rack and pinion control rod drive mechanism; [0006] 3) Electromagnetic lifting step-type control rod drive mechanism. [0007] Compared with other types of drive mechanisms, the electromagnetic lift step-type control rod drive mechanism has the advantages of simple structure, large lifting force, long life, and easy maintenance and replacement, so electromagnetic lift step-type control rods are commonly used ...

AI Technical Summary

Problems solved by technology

[0008] However, this mechanism cannot be directly used in ship reactors, because the reactor is always in a rocking state when the ship is sailing. At this time, the CRDM cannot always maintain a fixed vertical state, and it is no longer possible to rely solely on gravity as the driving force for the control rods to be inserted into the core. Safely implement the drop action

When the ship reactor tilts at a large angle or even capsizes, gravity becomes the resistance to the movement of the control rods to the active area of ​​the core, and the shutdown of the reactor cannot be achieved by only relying on gravity

And when the ship reactor capsizes and loses power at the same time, the drive rod will be thrown out from the active area of ​​the core, leading to the introduction of positive reactivity, which cannot guarantee nuclear safety

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